/Engine/Plugins/Runtime/MassGameplay/Source/MassCommon/Public/MassCommonFragments.h
This is a common type for all the wrappers pointing at UObjects used to copy data from them or set data based on Mass simulation..
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FObjectWrapperFragment : public [FMassFragment](API\Plugins\MassEntity\FMassFragment)